Re: More info: 2.1.108 page cache performance on low memory

Stephen C. Tweedie
1998-08-17T15:53:30Z

Hi,

Sorry, I'm just back from 2 weeks on holiday.

On Sun, 2 Aug 1998 00:19:52 -0500 (CDT), Eric W Biederman
<eric@flinx.npwt.net> said:

>> We *need* a mechanism which is block-aligned, not page-aligned. The
>> buffer cache is a good way of doing it. Forcing block device caching
>> into a page-aligned cache is not necessarily going to simplify things.

> The page-aligned property is only a matter of the inode,offset hash
> table, and virtually nothing else really cares. Shrink_mmap, or
> pgflush, the most universall parts of the page cache do not.

Any mmap()able files *need* to be page aligned in cache. Internal
filesystem accesses are always block aligned, not page aligned. That's
the conflict.

--Stephen